三种表面活性剂对Fe3O4纳米颗粒的形貌影响

Morphology Control of Fe3O4 Nanoparticles by Addition of Three Surfactants

选用十六烷基三甲基溴化铵(CTAB)、聚乙烯吡咯烷酮(PVP)、十二烷基磺酸钠(SDS)3种表面活性剂,研究了这3类不同表面活性剂和不同添加量对Fe3O4纳米颗粒的形貌调控作用,利用透射电镜(TEM)对样品进行表征分析,并给出了机理解释。结果表明:1)3种不同的表面活性剂的加入都获得球形或近球形的纳米颗粒。根据TEM及沉积时间的综合分析,3种活性剂的平均粒径比较:SDS<CTAB<PVP,证明加入SDS表面活性剂获得较小的Fe3O4纳米颗粒;2)以CTAB作为表面活性剂,当其用量增加到一定程度,纳米粒径呈现减小的趋势。以SDS和PVP作为表面活性剂,随着用量增加,纳米粒径呈现逐渐减小的趋势。对Fe3O4纳米颗粒的制备及应用具有一定的参考价值。

Surfactants were utilized in the fabrication of Fe3O4 nanoparticles because they could regulate the surface properties of the nanoparticles.Morphology regulation of the Fe3O4 nanoparticles were investigated systematically by adding three kinds of surfactants which contained cetyltrimethylammonium bromide(CTAB),polyvinylpyrrolidone(PVP) and sodium dodecyl sulfonate(SDS) and different amounts of surfactants.The samples were characterized by transmission electron microscopy(TEM),and the mechanism was explained.The results showed that:1)Spherical or near-spherical nanoparticles were obtained by the addition of three different surfactants.Based on the comprehensive analysis of TEM and deposition time,the average particle sizes of the three surfactants were compared:SDS<CTAB<PVP.The smaller Fe3O4 nanoparticles could be obtained by adding SDS surfactant;2)When CTAB was used as surfactant,the nanoparticle size tended to decrease with the increase of CTAB dosage.The nanoparticle size decreased gradually when the amount of SDS and PVP surfactants were increased.It has certain reference value toward the fabrication and applications of Fe3O4 nanoparticles.